The HTC EVO 3D for Sprint is coming any day now, and it looks like RadioShack might be preparing itself for pre-sale orders soon. According to a leaked ad, the smartphone, capable of recording and display 3D video content, will be going for $199.99 with a two-year contract, and $499.99 if purchased unactivated. Additionally, it will be preloaded with Green Hornet 3D, for better or worse (I find Seth Rogen to be entertaining).

Best of all, the ad says that you can get a $100 credit if you trade in your HTC EVO 4G, or Shift 4G towards the purchase of the new device. That’s not a bad deal at all if you’re rocking the EVO 4G or Shift 4G and you were planning on upgrading to this thing. Of course, you’d probably squeeze a few extra bucks selling it on eBay or Craigslist, but then you’d be dealing with shipping and annoying low-ballers before finding a good deal.

If you’ve been aching for a glasses-free 3D phone, this is your year: in addition to the EVO 3D for Sprint, the LG Optimus 3D will be arriving for AT&T in the form of the Thrill 4G some time later, too. It seems a little gimmicky, but who knows, maybe people will really take to this new fad and it’ll become a thing.

The EVO 3D is an Android 2.3 Gingerbread device that sports two cameras in the back so that you can record 3D video footage, or shoot 3D photos. When you want to switch to 2D mode, the smartphone will only use one of the two cameras. It also has a 4.3-inch qHD capacitive touchscreen and a dual-core 1.2GHz Snapdragon processor, so you know this thing won’t be a slouch in the performance department.

Word is that we’ll be seeing the EVO 3D on June 4, so we won’t be holding our breath too much longer.